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Unformatted text preview: firstname.lastname@example.org- icl.syr.edu ELE232 Electrical Fundamentals II – 7MAR2008 Homework 6 - Due: Wednesday, 19MAR2008 [ This homework will carry extra credit that can be added to your Exam 2 totals . ] Problem 1 : (a) Based on the circuit diagram, give values for V GS and I G . (b) Calculate a value for the drain current I D . (c) Pick a value for R D so that the voltage drop from drain to source V DS equals 10v . (a) There is no voltage source in the gate-source loop so V GS = 0v . The gate current I G is also zero since it takes more than 0.5 v to forward bias the gate-source pn junction. (b) The curve that separates the resistive region from the amplifier (constant current) region on the drain-source characteristic is given by I D = KV DS 2 = I DSS V P 2 V DS 2 . There are two equation used to describe I D in the constant current region. I D = K(V GS ! V P ) 2 or I D = I DSS 1 ! V GS V P " # $ % & ’ 2 . Since V GS = 0v , it follow that I D = I DSS = 5ma . R D will be chosen latter so that V DS = 10v . From the equation above, the transistor is biased in its constant current region when V DS > I D I DSS |V P | = 4 v . (c) V DS = 10 v = V DD ! I D R D = 20 v ! 5 ma R D ( ) . Choose R D = 2K and V DS = 10v ....
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This note was uploaded on 05/02/2008 for the course ELE 232 taught by Professor Phelps during the Spring '08 term at Syracuse.
- Spring '08